Waters, 70, is no stranger to war. His lost his father in World War II and his grandfather in World War I.

"I'm not a U.S. citizen, but I pay taxes here, and I wish a far greater percent of my tax dollars went to look after these guys," Waters told the AP.

Waters also performed at last year's "Stand Up for Heroes" concert, when he played "Wish You Were Here" with 14 wounded veterans.

Pink Floyd was founded in 1965 by Waters, Syd Barrett, Nick Mason, and Richard Wright, and David Gilmour joined as a fifth member in 1967. Their albums "The Wall" and "Dark Side of the Moon" are considered two of the greatest rock albums of all time.

The Bob Woodruff Foundation was started by the ABC journalist after he suffered serious injuries by an explosive device while covering the war in Iraq in 2006. The foundation raises funds to assist returning veterans and their families readjust to civilian life.

"I never imagined any of this when I woke up out of that coma," Woodruff told the AP. "You wake up in the hospital happy to be alive, but then realize we're not the same anymore."